Henry dal



i Y '.nitrb. gint-z5,'gettati'V lfifirr. i

n EN RY na L n, :or n osrpr, 4Massa. o H Us E'rrs.

. ncnmdmt 1v. 62,399, am@ Para@ 2e, 1367.. i

mnovnn Drvrclz ron BBGULATING THB BrvoLunoror PnornLLnBs or srrm vessels.' -i

ro ALI.A WHoM rr MAY coNonnN': l

Be it known that I, ITEMLY Dani-of Boston; in..the countyof Suil'olln and. State of Massachusetts, have invented a new and useful ixnproremeptin. thc Method of' Regulating the Revolution of the Propellingl Shafts of Steam Vessels, ofV which the followingis a full, clear, and exact description, reference being had .to the accompanying drawings, making a'part'oi` this specification, in willich-4 v Figure 1 represents a plan view Vot' the apparatus uned in carrying out my invention. Figure 2, a transverse section of the same on the line :c x of iig. 1;` and' v Figure 3 is a modification of a'rleviee used in carrying out my invention.

Similar letters of reference indicate like parts in the severalV figures.

The ohjeetof my invention is toprevent the too rapid revolution of-the propeller shaft or racing of the engine, asAit is termed, oceanimied by the propelling sci-er.l heftig raisediout of the water in an uneven sea; and,

the invention consstsin the employment of means forpreventing such 1;acing" by the application of friction to the propeller sliiift, by means oi' the resista-nce or rnrying'pressure offhe wateracting upon an elastic enhstanccor a piston, or other cquivaleiitrlerice attached to the hull of tho vessel, the said spring or equivalent device being connected inv any suitable manner with the propeller shaft.4

'The invention lis based upon the principle of the presaureof tllcvfater being greater upon an object the deeper the latter is submerged, while the snicl'pressnre decreases as the object rises to tl\esuri`a-ee. Referring to thc-drawings, c represents thc hu'll of rirersiel.I represents an upright or standard (there being tivo of the same) securely attached to the inner sides of the lmlLan'd supporting the two friction-rollers .or cylinders C ',lhee rollers'arn euch provided with gear-wheels, '11', at ont cnil, engaging with each other,

nrlon the shaft S is also a gear-nlroei, i, which may be. thrown at pleasure in orv out of gear with one of. thc :aforesaid gaar-wheels. Over the frictiomrollers C C -ia arranged a brake-block, d, formed, as show-nl iniig. 2, so as to covera large portion of t-he surface ot' each roller.. The friction-block d "is attached fo a har, c, which-s hinged orpivoted te a projecting piece,f, secured to the inner lsident' the hull` The har a extends across lthe vessel- .ti'amversely, und to the Aother or freoendgof the same isattached a rod bearing a piston, laat its lower'- end. The piston Il' is 'placed within a mbe or cylinder, g, secured to the inner sirlc of the resscls haii, and extending through-thc same, with an opening at its outer end. The piston' h is adjusted and held in proper position hy means of a coiled spring, arranged as shown, or a rubber or other suitable spring may housed. The

, piston-rod is attached to the transverse .bar e in such a manner as to admit of the said rod and piston moving freely in the tube g; y l

The operation is as i'ollws: When 4the vessel is in a smooth se. and in proper trim, the piston h vrill be at adjusted as to cause the brake .d toA be free from the friction-rollers C C. 'When in' a rough and lluieren the stem (if. the vessel Iri'll alternately rise and fall, causing the propeller to be at times nearly yont of wager and again deeply-'submerged in theszzine. When out of water, and'free from the resistanceoi the saure, the unchecked action of tbe 'ill use the propeller to rcvolrerery rapidly. In the operation of' my intention, ss the portion of the weasel' in which the cylinder and piston are placed rises, the resistance of the water will he @intim ishcd upon the piston, caning the latter to descend, and thus bringing the brake d to hear upon the :felis C C, which., by their connection through the 'gears f f f with the :haft S, will oer a sntheient resistance to ovcrrome the increased action of theengine usually termed the rac ing.. As the 'said portion of the vessel dc''tn.

the will rise by the increased pressure of the water and the brahed n'ill rise from` the rolk'rs VC C, and

than ain automatic action ,will he eetalalished to operate 'as circumstances' require.

, I have described my invadienas applied to the shaft of a. propeller in the stern of'n vessel. It is obvious,

however. that thefsum'e principle may he applied to the shafts of side-Wheel Steamers. i i

Having tghus ycecribcd my inrcntion, what I claim as new, nml desire tosoeure by Letters Patent, The automatic regulatie-not' the 'motion of the propeller shaft of a stemnvessel by means; of devices peratecl by the resista-nce or varying pressure of the wat-er. I

In testimony whereof l have signed my naine to this specification in the presence of. tiro A:suhsci'aizng titnesses.

HENRY DALE.

Witnesses:

J. H. Aunis, G. A. C. Sinin. 

